/*
 * Copyright 2023 devaper
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.github.devaper.pigeon.support.component

import com.fasterxml.jackson.core.type.*
import com.fasterxml.jackson.databind.*
import io.github.devaper.pigeon.component.*
import io.github.devaper.pigeon.exception.*
import io.github.devaper.pigeon.request.*
import io.github.devaper.pigeon.response.*
import io.github.devaper.pigeon.util.*
import java.lang.reflect.*
import java.nio.charset.*

open class JacksonHttpMessageConverter(
    private val defaultCharset: Charset = StandardCharsets.UTF_8
) : HttpMessageConverter {

    private val acceptMediaType = MediaType("application", "json", defaultCharset)

    private val objectMapper = ObjectMapper()

    override fun serialize(requestTemplate: RequestTemplate, value: Any?) {
        requestTemplate.addHeader("Content-Type", acceptMediaType.toSimpleString())
        requestTemplate.requestBody = objectMapper.writeValueAsString(value).toByteArray(charset = defaultCharset)
    }

    override fun deserialize(responseTemplate: ResponseTemplate, type: Type): Any? {
        if (responseTemplate.bodyBytes == null) {
            return null
        }
        val targetMediaType = MediaType.parse(responseTemplate.contentType)
        if (targetMediaType == null || acceptMediaType.match(targetMediaType)) {
            throw UnsupportedMediaTypeException(
                replayMediaTypeRaw = responseTemplate.contentType,
                acceptMediaType = acceptMediaType
            )
        }
        val content = String(responseTemplate.bodyBytes, targetMediaType.charset ?: defaultCharset)
        return objectMapper.readValue(content, createTypeReference(type))
    }

    protected open fun createTypeReference(type: Type) = object : TypeReference<Any>() {
        override fun getType(): Type {
            return type
        }
    }
}